List and briefly describe the four stages of whole-cell migration
What will be an ideal response?
ANSWER: In the first stage, the front and back ends of a cell becomes defined by a polarization
process. In the second stage, the front end of the cell protrudes as actin microfilaments assemble into long, parallel bundles. In the third stage, the cell adheres to the surrounding
extracellular matrix. In the fourth stage, adhesion at the rear end of the cell is released, and
the cell migrates forward and adheres to a new attachment point.
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Arteries
a. are under greater pressure than veins. b. are thinner than veins. c. carry blood toward the heart. d. have valves to prevent backflow.
A decrease in cortisol triggers secretion of CRH (corticotropin-releasing hormone) by the hypothalamus which then stimulates secretion of ____ by the anterior pituitary
a. cortisol b. adrenocorticotropic hormone c. adrenal cortex-stimulating hormone d. cortisol-stimulating hormone e. aldosterone
Which of the following is an important difference between the rough endoplasmic reticulum and the smooth endoplasmic reticulum?
a) the rough endoplasmic reticulum is the site of much protein folding and packaging, whereas the smooth endoplasmic reticulum is the site of lipid synthesis b) the smooth endoplasmic reticulum is the site of protein synthesis, folding, and packaging, whereas the rough endoplasmic reticulum is the site of lipid synthesis c) the rough endoplasmic reticulum is covered in ribosomes, whereas the smooth endoplasmic reticulum is not d) the rough endoplasmic reticulum is studded with chloroplast, whereas the smooth endoplasmic reticulum is not e) both the first and third answer choices are correct
Discovery science is primarily based on ________
A) hypothesis testing B) deduction C) experimentation D) observation